CN111224245A - Honeycomb electromagnetic wave-absorbing reinforcing structure - Google Patents
Honeycomb electromagnetic wave-absorbing reinforcing structure Download PDFInfo
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- CN111224245A CN111224245A CN202010031379.8A CN202010031379A CN111224245A CN 111224245 A CN111224245 A CN 111224245A CN 202010031379 A CN202010031379 A CN 202010031379A CN 111224245 A CN111224245 A CN 111224245A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
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- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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Abstract
The invention belongs to the technical field of electronic materials, and particularly relates to a honeycomb electromagnetic wave-absorbing reinforcing structure. After a reinforcing material layer is added between the hole wall of the honeycomb structure and the wave-absorbing coating, the wave-absorbing frequency point is shifted to the left, the wave-absorbing performance of the low frequency band (2-8GHZ) is improved, and the absorption of incident wave energy of more than 90% in the bandwidth of 2-18GHZ is realized. Under the condition that the cross section shape of the honeycomb structure hole and the height h of the honeycomb structure are not changed, the mechanical strength is greatly improved, and compared with the traditional electromagnetic wave-absorbing sandwich structure, the out-of-plane flat-pressing elastic modulus and the yield strength of the sandwich structure are greatly improved. But the invention can realize the same wave-absorbing capability while enhancing and ensuring the mechanical property, and the thickness of the coating required by the wave-absorbing reinforced structure is smaller than that of the traditional wave-absorbing structure, thereby reducing the weight increase.
Description
Technical Field
The invention belongs to the technical field of electronic materials, and particularly relates to a honeycomb electromagnetic wave-absorbing reinforcing structure.
Background
The structural stealth material is a bifunctional composite material developed on the basis of an advanced composite material, can be stealthed and borne, can form various parts with complex shapes, such as wings, empennages, air inlet channels and the like, does not increase the extra mass of an airplane, is favorable for widening an absorption band, and is a main development direction of the modern stealth material.
The sandwich structure composite material is a typical structural design scheme with light weight, high strength and high rigidity, organically combines the high strength and high modulus of a panel with the low density and high rigidity of a sandwich core, and has extremely important application value in the fields of aerospace and the like. Such as hexagonal honeycomb structures imitating natural honeycombs, are widely used as core for sandwich structures due to their light weight and relatively high specific strength and specific stiffness.
The traditional method for enhancing the mechanical strength of sandwich structure composite materials mainly comprises the steps of changing the shape of the cross section of a sandwich core (such as a square structure and a pyramid structure), designing a multilayer structure, increasing the structural height of the sandwich core and the like. However, the traditional wave-absorbing structure such as a microwave dark room and a metamaterial considers the wave-absorbing performance and bandwidth but does not consider the higher requirement on mechanical strength in practical application, and the good absorption efficiency of the traditional wave-absorbing structure can bring about a sharp increase in the structure thickness. Meanwhile, the bearing capacity of the honeycomb sandwich structure is designed only by focusing on the improvement of yield strength, energy absorption, elastic modulus and other mechanical properties, and the matching and interference problems of the mechanical bearing capacity and the broadband wave absorbing capacity born by the sandwich structure in application are not considered at present.
Therefore, how to improve the wave absorbing performance of the radar wave absorber and enhance the mechanical strength of the structure at the same time is a problem to be solved urgently in the technical field of the current electromagnetic wave absorption.
Disclosure of Invention
Aiming at the problems, the invention provides a honeycomb electromagnetic wave-absorbing reinforced structure and a design method thereof, aiming at solving the problem that the existing honeycomb sandwich wave-absorbing structure can not ensure that the wave-absorbing performance and the mechanical strength can be improved simultaneously. The structure realizes more than 90 percent of effective absorption of incident electromagnetic waves in a broadband range of 2-18GHZ, particularly improves the wave absorbing performance of a low frequency band, and increases the out-of-plane flat-pressing elastic modulus by 189 percent compared with the prior honeycomb electromagnetic wave absorbing structure. The principle of the method is that the reinforcing material contains a reinforcing component, and the reinforcing component is coated on the surface of the honeycomb, so that the thickness of the honeycomb and the equivalent electromagnetic parameters of the honeycomb structure are changed.
The honeycomb electromagnetic wave-absorbing reinforcing structure comprises a bottom metal base plate and a sandwich structure above the bottom metal base plate.
The sandwich structure is a honeycomb structure, and a reinforcing material layer and a wave-absorbing coating are sequentially and uniformly coated on the surface layer of the hole wall of the honeycomb structure, namely the wave-absorbing coating is coated on the surface layer of the reinforcing material layer (as shown in figure 2).
The real part of the equivalent relative dielectric constant of the cell wall of the honeycomb structure is not less than 1.23 and not more than epsilonrNot more than 1.29, and tan delta of 0.02 to not more thanrNot more than 0.05, and the real part of equivalent relative permeability is not less than 0.945 murNot more than 1.005, and tan delta of 0.01 or lessεLess than or equal to 0.05; the reinforcing material layer is resin paint, the real part of the equivalent relative dielectric constant is between 2.6 and 3.5, the loss tangent is zero, and the real part of the equivalent relative magnetic permeability is more than or equal to 0.995 murNot more than 1.005, and tan delta of 0.001εLess than or equal to 0.005; the wave-absorbing coating is uniformly distributed in the honeycomb hole along the axial direction of the hole column, and the thickness of the wave-absorbing coating is t1。
Further, the cross section of the honeycomb structure hole is hexagonal, quadrangular or triangular.
Furthermore, the honeycomb structure is made of aramid fiber paper, the cross section of the honeycomb structure hole is hexagonal, (as shown in fig. 2) r is the outer side length of the honeycomb hole of the white honeycomb hexagonal, and w isIs the thickness of a single-layer aramid paper, t0The thickness of the reinforcing material; the wave-absorbing coating is uniformly distributed in the honeycomb hole along the axial direction of the hexagonal prism, and the thickness of the wave-absorbing coating is t1The height of the whole periodic honeycomb structure is h.
According to the invention, after a reinforcing material layer is added between the hole wall of the honeycomb structure and the wave-absorbing coating, the wave-absorbing frequency point is shifted to the left, the wave-absorbing performance of the low frequency band (2-8GHZ) is improved, and the absorption of more than 90% of the incident wave energy in the bandwidth of 2-18GHZ is realized, as shown in figure 3. Under the condition that the cross section shape of the honeycomb structure hole and the height h of the honeycomb structure are not changed, the mechanical strength is greatly improved, and compared with the traditional electromagnetic wave-absorbing sandwich structure, the out-of-plane flat-pressing elastic modulus and the yield strength of the sandwich structure are greatly improved (as shown in figure 6). Within a certain coating thickness range, along with the increase of the thickness of the wave-absorbing coating, the wave-absorbing performance of the traditional wave-absorbing sandwich structure is enhanced, as shown in fig. 5. But the invention can realize the same wave-absorbing capability while enhancing and ensuring the mechanical property, and the thickness of the coating required by the wave-absorbing reinforced structure is smaller than that of the traditional wave-absorbing structure, thereby reducing the weight increase.
Drawings
FIG. 1 is a diagram of the overall effect of the honeycomb wave-absorbing reinforcement structure of the embodiment;
FIG. 2 is a parameter diagram of a cross section of a honeycomb hole unit of the wave-absorbing reinforced honeycomb structure in the embodiment;
FIG. 3 is t1Reflectance curves for the conventional honeycomb and the inventive honeycomb at 0.01 mm;
FIG. 4 is t1Reflectance curves for the traditional honeycomb structure and the inventive honeycomb structure at 0.015 mm;
FIG. 5 is t10.01 reinforced honeycomb and t1Reflectance of 0.015,0.02 for a conventional honeycomb;
FIG. 6 is a compression load-travel curve for a conventional honeycomb structure and a honeycomb structure of the present invention;
FIG. 7 is t1Reflectance curves for the conventional honeycomb and the inventive honeycomb at 0.02 mm.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1: the specific size parameters of the honeycomb wave-absorbing reinforced structure are (unit mm): r 1.83, w 0.1, t0＝0.01，t1＝0.01，h＝23。
The electromagnetic wave absorber obtained by the design has a reflection coefficient of at least below-10 dB at 2-18GHZ under the condition of normal incidence of uniform plane waves, wherein the reflection coefficient of below-15 dB is in a frequency band of 6.8-18GHZ, as shown in figure 3. According to GB/T1453-2005 standard, honeycomb core flat crush performance test is carried out, the result is shown in FIG. 6, and according to the load-stroke curve, the out-of-plane flat crush elastic modulus is increased by 189%, the yield strength is increased by 152%, and the enhancement of the elastic modulus and the yield strength can be obviously seen.
Example 2: the specific size parameters of the honeycomb wave-absorbing reinforced structure are (unit mm): r 1.83, w 0.1, t0＝0.01，t1＝0.015，h＝23。
The electromagnetic wave absorber obtained by the design has a reflection coefficient of at least below-10 dB at 2-18GHZ under the condition of normal incidence of uniform plane waves, wherein the reflection coefficient of below-15 dB is in a frequency band of 5-18GHZ, as shown in figure 4. The load-displacement curve of the out-of-plane compression experiment process is the same as that of the embodiment 1, the reason is that the improvement of the mechanical property of the reinforced structure mainly depends on the reinforcing material of the middle layer, and the thickness change of the wave-absorbing coating on the outer surface hardly influences the flat compression property.
Example 3: the specific size parameters of the honeycomb wave-absorbing reinforced structure are (unit mm): r 1.83, w 0.1, t0＝0.01，t1＝0.02，h＝23。
The electromagnetic wave absorber obtained by the design has a reflection coefficient of at least below-5 dB at 2-18GHZ under the condition of normal incidence of uniform plane waves, wherein the reflection coefficient of below-10 dB is provided in a frequency band of 10-18 GHZ. As shown in fig. 7. The wave-absorbing performance is reduced compared with that of the embodiments 1 and 2, and the reason is that the thickness of the wave-absorbing coating is increased, and the matching between the equivalent dielectric constant and the magnetic conductivity of the honeycomb structure and air is poor. The load-displacement curve of the out-of-plane compression experiment process is the same as that of the embodiment 1, the reason is that the improvement of the mechanical property of the reinforced structure mainly depends on the reinforcing material of the middle layer, and the thickness change of the wave-absorbing coating on the outer surface hardly influences the flat compression property.
In summary, after a reinforcing material layer is added between the hole wall of the honeycomb structure and the wave-absorbing coating, the wave-absorbing frequency point moves to the left, the wave-absorbing performance of the low-frequency band (2-8GHZ) is improved, and the absorption of more than 90% of the incident wave energy in the bandwidth of 2-18GHZ is realized, as shown in figure 3. Under the conditions of not changing the cross-sectional shape of honeycomb holes and increasing the height h, the mechanical strength is greatly improved, and compared with the traditional honeycomb electromagnetic wave-absorbing structure, the out-of-plane flat-pressing elastic modulus is increased by 189%, and the yield strength is increased by 152% (as shown in fig. 6). The wave-absorbing reinforced structure can realize the same wave-absorbing capacity while enhancing and ensuring the mechanical property, and the thickness of the coating required by the wave-absorbing reinforced structure is smaller than that of the traditional wave-absorbing structure, thereby reducing the weight increase. The wave-absorbing structure provided by the invention can improve the wave-absorbing performance of the radar wave absorber and enhance the mechanical strength of the structure.
Claims (3)
1. The utility model provides a honeycomb electromagnetism wave absorption reinforced structure which characterized in that: comprises a bottom metal bottom plate and a sandwich structure above the bottom metal bottom plate;
the sandwich structure is a honeycomb structure, and a reinforcing material layer and a wave-absorbing coating are sequentially and uniformly coated on the surface layer of the hole wall of the honeycomb structure, namely the wave-absorbing coating is coated on the surface layer of the reinforcing material layer;
the real part of the equivalent relative dielectric constant of the cell wall of the honeycomb structure is not less than 1.23 and not more than epsilonrNot more than 1.29, and tan delta of 0.02 to not more thanrNot more than 0.05, and the real part of equivalent relative permeability is not less than 0.945 murNot more than 1.005, and tan delta of 0.01 or lessεLess than or equal to 0.05; the reinforcing material layer is resin paint, the real part of the equivalent relative dielectric constant is between 2.6 and 3.5, the loss tangent is zero, and the real part of the equivalent relative magnetic permeability is more than or equal to 0.995 murNot more than 1.005, and tan delta of 0.001εLess than or equal to 0.005; the wave-absorbing coating is uniformly distributed in the honeycomb hole along the axial direction of the hole column, and the thickness of the wave-absorbing coating is t1。
2. The cellular electromagnetic wave absorption reinforced structure of claim 1, wherein: the cross section of the honeycomb structure hole is hexagonal, quadrangular or triangular.
3. The cellular electromagnetic wave absorption reinforced structure of claim 1, wherein: the honeycomb structure is made of aramid fiber paper, the cross section of a honeycomb structure hole is hexagonal, r is the outer side length of a honeycomb hole of a white honeycomb hexagonal, w is the thickness of single-layer aramid fiber paper, and t is0The thickness of the reinforcing material; the wave-absorbing coating is uniformly distributed in the honeycomb hole along the axial direction of the hexagonal prism, and the thickness of the wave-absorbing coating is t1The height of the whole periodic honeycomb structure is h.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112118720A (en) * | 2020-09-18 | 2020-12-22 | 华中科技大学 | Heat conduction wave-absorbing patch |
| CN112906156A (en) * | 2021-02-08 | 2021-06-04 | 电子科技大学 | Equivalent electromagnetic parameter extraction method of special-shaped honeycomb wave-absorbing structure |
| CN112986943A (en) * | 2021-03-01 | 2021-06-18 | 西安电子科技大学 | Method for calculating electromagnetic scattering of honeycomb composite material target |
| CN114498056A (en) * | 2022-02-23 | 2022-05-13 | 电子科技大学 | Broadband wave-absorbing honeycomb composite structure |
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| CN112906156B (en) * | 2021-02-08 | 2022-03-15 | 电子科技大学 | Equivalent electromagnetic parameter extraction method of special-shaped honeycomb wave-absorbing structure |
| CN112986943A (en) * | 2021-03-01 | 2021-06-18 | 西安电子科技大学 | Method for calculating electromagnetic scattering of honeycomb composite material target |
| CN112986943B (en) * | 2021-03-01 | 2024-01-12 | 西安电子科技大学 | Method for calculating electromagnetic scattering of honeycomb composite material target |
| CN114498056A (en) * | 2022-02-23 | 2022-05-13 | 电子科技大学 | Broadband wave-absorbing honeycomb composite structure |
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